A closer look at the trigonometric ratios Student activity Play

A perpendicular through a point off the line Simulation Play

A perpendicular through a point off the line Student activity Play

A perpendicular through a point on the line Simulation Play

A perpendicular through a point on the line Student activity Play

A staircase Student activity Play

Archimedes' contemplation Animation Play

Construction of a cone Simulation Play

Construction of a right-angled triangle Simulation Play

Finding sides Student activity Play

Finding sides in the triangle Whiteboard exercise Play

Finding the exact values of trigonometric ratios for selected angles Student activity Play

Finding the measures of all angles and sides Animation Play

How do you find the ratio? Student activity Play

How do you find the ratio? Animation Play

Other trigonometric ratios Student activity Play

Other trigonometric ratios Whiteboard exercise Play

Perpendicular streets Whiteboard exercise Play

Right-angled triangle or not? Animation Play

Solving triangles Whiteboard exercise Play

Solving triangles Whiteboard exercise Play

Solving triangles Student activity Play

The cone Student activity Play

The converse of the Pythagorean theorem Student activity Play

The converse of the Pythagorean theorem Whiteboard exercise Play